Will Saletan writes about politics, science, technology, and other stuff for Slate. He’s the author of Bearing Right.

I expected better. The Brits, after all, are the people who gave us Question Time, a daily ritual in which members of Parliament interrogate government ministers. Our public-affairs TV network, C-SPAN, treats this as a model of transparency, accountability, and lively debate. But in security matters, the U.K. has a long way to go. When the spy chiefs were asked in today’s committee session about domestic surveillance, they gave the same pat answers U.S. intelligence officials tried to peddle in early post-Snowden congressional hearings. They alluded to “safeguards,” “rigorous oversight,” and “internal rules.” The committee’s members failed to press for evidence or clarification.

The committee’s chairman, Sir Malcolm Rifkind, asked the spymasters why they had to monitor the entire public in order to catch evildoers. Sir Iain Lobban, the director of GCHQ, assured Rifkind that the government’s data harvesters don’t exceed what’s necessary and proper, since “there are very specific legal thresholds,” and “I don’t employ the type of people who would” spy on innocent civilians. “My people are motivated by saving lives,” Lobban sniffed.

In a congressional hearing, this is the kind of assertion that prompts somebody on the panel to ask for details. What legal thresholds? What internal rules? Instead, Rifkind thanked Lobban: “You’ve given a very full response.”

Ten minutes later, Rifkind asked Andrew Parker, the director general of MI5, for “specific examples” of damage done to British intelligence by the disclosure of surveillance methods. Parker offered to give the committee examples in closed session, but he assured Rifkind that thanks to GCHQ’s data collection, “there are real instances” of the government “finding terrorist plots that we would not otherwise find that we’re then able to thwart, which leads to lives being saved.” Again, this is the kind of assertion that often unravels under scrutiny in congressional hearings. But in the British forum, it went unchallenged.

Lobban claimed to have solid evidence. “What we have seen, over the last five months, is near daily discussion among some of our targets” showing damage from recent surveillance disclosures, he told the committee.

We’ve seen terrorist groups in the Middle East, in Afghanistan, and elsewhere in South Asia discussing the revelations in specific terms, in terms of the communications packages that they use, the communications packages that they wish to move to. … We have actually seen chat around specific terrorist groups, including close to home, discussing how to avoid what they now perceive to be vulnerable communications methods, or to how to select communications which they now perceive not to be exploitable.

At this point in an American hearing, you’d expect some congressman to ask the witness how we have such good intel on this “chat” if the bad guys have learned how to evade our surveillance. But nobody on the British panel raised that question.

Why was the interrogation so lame? I can imagine several reasons. The British spy agencies are only supporting actors in the surveillance story. The NSA is the main target, so Congress feels pressure to do something. Libertarianism and distrust of government are also less prevalent in the United Kingdom. One member of the British committee told the spy chiefs that in national polls, “about 60 percent of the public either think that you’ve got the right amount of powers, or indeed, some members of the public think you need more powers.” In addition, the Brits have a stronger faith in the decency of public servants. When NSA officials tell Congress that their employees are good people, we nod but persist. We want to know what laws and mechanisms are in place to prevent abuse.

Two other things about the hearing struck me as odd. One was this comment from Parker, the MI5 boss: “There have been times over the years when successive governments have offered my service greater powers and greater measures. And we’ve said they’re disproportionate and turned away from them.”

Really? What sort of powers? When did this happen? Who made the offers? Who turned them down? I’ve never heard of a government agency refusing an invitation to expand its authority. And if I were an ordinary Brit, I’d want to know what “disproportionate” measures my government offered to the intelligence services. Nobody followed up on this comment. Somebody should.

The other curious thing was Lobban’s preoccupation with child sexual abuse. When a member of the panel asked how the Internet has changed the work of the intelligence agencies, Lobban replied:

It’s not simply about terrorism. It’s also about serious crime. I could mention some of the work we do with the child exploitation online protection agency in terms of working with them to uncover the identities, track down some of those who are involved in online sexual exploitation of children within the U.K., including from overseas. There’s a recent case where we managed to do that, where we used our intelligence capabilities to identify those, and, with the help of a foreign partner, then to bring them to justice. And two people are now in jail.

Later, again unprompted, Lobban returned to this subject:

There is a fragile mosaic … of strategic capabilities which allow us to discover, to process, to investigate, and then to take action. … It allows us to reveal the identities of those involved in online sexual exploitation of children. Those people are very active users of encryption and of anonymization. That mosaic is in a far, far weaker place than it was five months ago.

Lots of people are willing to put up with mass surveillance, at least at the data collection stage, in order to stop terrorists. But will they put up with it to catch sexual abusers? Doesn’t that open the door to broader collection of communications to detect crime generally? Someday, perhaps, a member of Parliament will put that question to Britain’s intelligence agencies. Today was not that day.